Using Events¶
From GeoNetwork 3.0.x on, there are a number of events you can listen to on your Java code.
Enabling Event Listeners¶
To enable this on your Maven project, you have to add the event dependencies. Edit the file custom/pom.xml and add the dependencies tag:
<dependencies>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>events</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>core</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
Then create the file custom/src/main/resources/config-spring-geonetwork.xml to tell Spring to load your custom beans adding the following content:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=
"http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<bean class="org.fao.geonet.events.listeners.MyCustomListener" ></bean>
</beans>
This file should contain a list of all the classes that listen to events inside GeoNetwork scope.
Simple Example¶
We can add a simple example listener like this one, which will print a string every time a metadata gets removed.
For example, we can call an external REST API that gets triggered every time a Metadata gets removed or updated.